RECOIL RANGE MEASUREMENTS OF REACTIONS INDUCED IN Ni$sup 58$ WITH 46- TO 68- Mev HELIUM IONS

Journal Article · Mon May 25 04:00:00 EDT 1964 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.134.B783· OSTI ID:4003432

Blann, M; Ewart, A

Ranges in /sup 58/Ni are reported for /sup 56/Ni, /sup 57/Ni, /sup 55/ Co, /sup 5 6/Co, /sup 57/Co, and /sup 58/Co recoil ions resulting from the bombardment of /sup 58/Ni with 46- to 68-Mev helium ions. The thick targetthick catcher method was used to obtain average recoil ranges in the beam direction. Measured ranges were compared with theoretical range predictions, calculated assuming full momentum transfer from the incident helium ions to the recoil ions. Theoretical range curves were corrected for the influence of alpha particle and nucleon evaporation. Experimental ranges measured from reaction thresholds to excitation function peaks agree with the corrected theoretical curves to within 10%. Recoil ranges for /sup 57/Co and /sup 57/Ni are shown to have predominate contributions from a low-momentum-transfer process in the energy range corresponding to the high-energy tail of the excitation functions. At higher energies the ranges and excitation functions are shown to increase, consistent with contributions from the onset of /sup 58/Ni ( alpha ,5-nucleon) compound- nucleus reactions. Recoil ranges for /sup 55/Co, /sup 56/Co, and /sup 56/Co are consistent with full momentum transfer over the entire energy range studied, including those ranges corresponding to the high-energy tail of the /sup 56/Co excitation function. Recoil ranges for /sup 56/Ni are consistent with full momentum transfer up to the peak of the excitation function, after which the range decreases sharply as a competing low momentum-transfer reaction becomes predominant. The details of the reaction mechanism responsible for the high- energy tails of the /sup 56/Ni, /sup 57/Co, and /sup 56/Ni excitation functions are discussed. In the case of the tail of the excitation-function for the formation of /sup 56/Ni, evidence is presented that the interaction is between the incident helium ion and one or two neutrons, rather than an ( alpha , alpha ') inelastic scattering followed by nucleon evaporation. It is concluded that differentiation between these two mechanisms in the case of the reactions forming /sup 57/Ni and /sup 57/Co is impossible. (auth)

• Research Organization: Univ. of Rochester, N.Y.
• NSA Number: NSA-18-021294
• OSTI ID: 4003432
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 134; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALPHA BEAMS
ALPHA PARTICLES
COBALT 55
COBALT 56
COBALT 57
COBALT 58
COMPOUND NUCLEI
CROSS SECTIONS
ENERGY RANGE
EVAPORATION MODEL
EXCITATION
HELIUM
INELASTIC SCATTERING
INTERACTIONS
ION BEAMS
MEASURED VALUES
MEV RANGE
MOMENTUM
NICKEL 56
NICKEL 57
NICKEL 58
NUCLEAR MODELS
NUCLEI
NUCLEONS
NUMERICALS
PHYSICS
REACTION KINETICS
RECOILS
SCATTERING
TARGETS
THICKNESS